This series was published in 2005–2007 by Baker Academic. I don't like Baker all that much. Evangelical Ressourcement Series (4 vols.)
How would it compare to: The Encyclopedia of Christianity, vols 1-5?
I would prefer a bit liberal take on Early Church History, but I don't know whether I can justify the price difference and I don't know what that encyclopedia is like, I'll see if I can have a look at it in a library within a month from now.